A Forked Tongue

I have somewhat of an an extensive vocabulary, which I give thanks to an authoritarian father.  My siblings and I all have a great command of the English language which has severed us well, but at the same times it is annoying.  I have a few friends and in-laws that are not as articulate as myself.  For the most part I can tell that I talk over their heads, the glazed look in their eyes usually gives it away.  I find that I have to stop mid-sentence at times, and search for a word that they would understand and that conveys  what I mean.  I try to speak “simple” English with them and my regular vocabulary with others.  Sometimes this is like speaking two different languages, or like a forked tongue.